[SOLVED] Error: Unknown Filesystem

ghostcamera · 08-30-2010, 12:05 PM

Hi Forum

I recently reinstalled windows 7 and then installed ubuntu 10.04 desktop version, i used the install method - install operating systems side-by-side. This worked, i was messing with the partitions within windows ( i tryed to delete one of them which was unallocated. Started my laptop this monring and its done this.

Ive tryed some things on the forum but i cannot seam to get this to work?

useful notes:
im a noobie when it comes to terminal
i have a live cd if this helps

other notes: i cannot even format my laptop with the original windows 7 cd =\

help as soon as possible would be appreciated

amani · 08-30-2010, 12:17 PM

Use the parted magic CD or the ubuntu Cd and
try to rescue system
try running gparted or #fdisk -l

post output

ghostcamera · 08-30-2010, 12:23 PM

when i try to boot from the live cd its saying..

PXE-E61: Media test failure, check cable
PCE-M0F:Exiting Broadcom PCE ROM
Operating System Not Found

ghostcamera · 08-30-2010, 12:41 PM

Quote:

Originally Posted by ghostcamera

when i try to boot from the live cd its saying..

PXE-E61: Media test failure, check cable
PCE-M0F:Exiting Broadcom PCE ROM
Operating System Not Found

nevermind got the disk working, this is what i get when i type sudo fdisk -l

Code:

Disk /dev/sda: 640.1 GB, 640135028736 bytes

device boot      start    end       blocks         id     system
/Dev/sda1          1      1530     12288000        27     unknown
/Dev/sda2     *  1530     1543     102400          7      HPFS/NTFS
/Dev/sda3        1543     36704    282432500       7      HPFS/NTFS
/Dev/sda4        36704    77826    330306561       f      W95 Ext'd (LBA)
/Dev/sda5        36704    51689    120366080       83     Linux
/Dev/sda6        51689    52328    5133312         82     Linux swap /Solaris
/Dev/sda7        52329    77826    204805120       6      Fat16

Soadyheid · 08-31-2010, 06:46 PM

Quote:

device boot start end blocks id system
/Dev/sda1 1 1530 12288000 27 unknown

The system doesn't know what sort of partition /dev/sda1 is.
Run

Quote:

fdisk /dev/sda1

, select 'l' to list known partitions and you'll see that ID 27 doesn't exist. As the MBR (Master boot record) will be on /dev/sda1, you couldn't boot from the disk as the system didn't know where to look for the boot data...

Quote:

PXE-E61: Media test failure, check cable
PCE-M0F:Exiting Broadcom PCE ROM
Operating System Not Found

This shows it's trying to boot across the network and not finding an image to download.

I'd try using fdisk to change the /dev/sda1 partition type from 27 Unknown to 7 HPFS/NTFS and see if it boots as before but...
"Be careful out there!"

Play Bonny!

michaelk · 08-31-2010, 08:54 PM

Welcome to LinuxQuestions.
Please do not use ASAP in your threads. We volunteer our time to help and your problem is not any more important that anyone else's.

The MBR is the first sector of the hard drive but it is not part of the first partition. When did you see the error? Do you see a boot menu?

Do you actually see

Quote:

error: unknown filesystem
grub rescue >

If so you can try using rescue mode and reinstall grub. Do you remember which partition(s) you were messing with?

ghostcamera · 09-02-2010, 07:03 AM

Thanks alot for all your help guys, although i managed to fix it myself.
michaelk i couldnt see the boot menu, i actully saw:

Code:

error: unknown filesystem
grub rescue >

There was a 150gb unallocated partition, i wanted this to be back into my orignal C drive in windows, so i was just messing round with it to fix it lol

Since i could boot ubuntu live disk, i reinstalled the O/S on entire disk, this sorted the bootmenu but also removed windows, so i ran a deep format boot disk (as it still wouldnt let me format using the original windows disk due to not finding a partition, i believe this was because of the ubuntu superblocks). The deep format took around 3-5 hours to do. it finally allowed me to install windows after this. i'm going to be looking at some guides on how to install ubuntu and windows correctly without causing problems like this again.